A design and build Ethiopian construction company asked us to sketch its new headquarters located on a functioning cement block factory plot. On a narrow strip and along a private street that links two public roads that may know fast development, we tried to conceive not only a landmark with a building but also with the outdoor space, allowing visitors and employees to move in a massive concrete « half pipe » behind which is protruding the office building, and, a step further, the factory. The main building conception respond to specific attention given to modular pattern allowing prefabrication and futur extension. In the northern facade massive U shaped elements, circulate people, MEP and passive thermal ventilation, while at the south, balconies provide shade to the open space and work stations. The laboratory testing concrete samples, is put aside and closer to public scale, being the window on the scientific activities of the company but participate to the same global effect.